
# 2.try :
#   statesment\\正常代码
#   ....
#   except:
#   statesment\\出现异常就会执行这些语句
#   ....
#   else:
#   statesment\\没有异常抛出的时候一定执行
#   ....
#   finally:
#   statesment\\不管有没有异常都会执行
#   ....
try:
    raise KeyboardInterrupt
finally:
    print('goodbye.....')
print('..................................................................')